Yuka is a housewife with a bedridden husband and a growing son. With no intimacy in her marriage, she spends her days feeling sexually frustrated. Then, a turning point arrives. Her son tells her that he is breaking up with his girlfriend because he couldn't perform well during sex. For her son's sake, Yuka decides to provide sex education using her own body. However, with her own pent-up sexual desires, her actions gradually begin to escalate...